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Bigdog
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« on: September 22, 2010, 04:33:24 PM » |
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I have recently bought a Valk that has been sitting with OLD gas in it...anyway I've been using seafoam in the tank with fresh gas.
I know most carbs have a "pilot jet" for low speeds/ idle.....and a main jet for Haulin it down the road....
It runs great after 40-50 miles an hour and rpm's are up. No problem it comes alive...BABY
I'm assuming that the pilot jets are the ones gummed up that really need the seafoam thru them...\
Here's the question .... would it be better to run it on the highway 65-75 mph for a couple of tanks ?? Or run at low speeds using mainly the pilot jets??
It may not make any difference either way I don't know..??
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This country, with its institutions, belongs to the people who inhabit it. Whenever they shall grow weary of the existing government, they can exercise their constitutional right of amending it or their revolutionary right to dismember it or overthrow it." -- Abraham Lincoln, 4 April 1861
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John Schmidt
Member
Posts: 15235
a/k/a Stuffy. '99 I/S Valk Roadsmith Trike
De Pere, WI (Green Bay)
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« Reply #1 on: September 22, 2010, 05:14:03 PM » |
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It's not the pilots that are gummed up, it's the slow jets. The pilots are merely needle type adjustments for the fuel/air mixture. The slow and high speed jets are like miniature tubes with holes in the sides. Try to find something called(I'm not certain of the exact name here) Gumout Regain FI carb cleaner. I've not tried it but have heard of good results. If the bike comes alive on the open road but is balky at low speeds/RPM's, then it's normally the slow jets that need cleaning or replacing. Some, like myself, just order some #38 slows from Chapparal, they're slightly larger than stock(#35) but don't affect mileage. I just replaced a set on a friend's I/S this past week, the bike had been sitting for quite some time and was all gummed up plus the float valves were messed up so replaced them as well. He came by today and said it's never run better, so that's something to consider if the Gumout doesn't do the job.
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Pete
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« Reply #2 on: September 22, 2010, 06:15:08 PM » |
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+1 John
Also check the tank for rust, and clean if needed.
John and I differ on the 38 pilots, I would stay with 35's. (just a minor difference of opinion either way should work fine)
I suspect you would be better served by just going ahead and removing and cleaning the carbs.
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Hoser
Member
Posts: 5844
child of the sixties VRCC 17899
Auburn, Kansas
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« Reply #3 on: September 22, 2010, 06:32:49 PM » |
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Try low speed while it is sputtering with the choke on all the way. Worked for me. Hoser
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #4 on: September 23, 2010, 03:18:03 AM » |
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Try heavy doses of fuel cleaner like Sea-foam or Tectron for several tanks and run the engine at lower speeds until it starts to clear itself, then lower the speed some more..
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Bigdog
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« Reply #5 on: September 23, 2010, 07:39:01 AM » |
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Thanks guys .... I appreciate the advice..!!
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This country, with its institutions, belongs to the people who inhabit it. Whenever they shall grow weary of the existing government, they can exercise their constitutional right of amending it or their revolutionary right to dismember it or overthrow it." -- Abraham Lincoln, 4 April 1861
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BF
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« Reply #6 on: September 23, 2010, 07:16:35 PM » |
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Try heavy doses of fuel cleaner like Sea-foam or Tectron for several tanks and run the engine at lower speeds until it starts to clear itself, then lower the speed some more..
Please define "lower" speeds. 45 or less maybe? Also, where would I find instructions for replacing/cleaning the slow jets? Looked in Shoptalk, but didn't readily see anything. |
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ricoman
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« Reply #8 on: September 24, 2010, 02:05:43 AM » |
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Please define "lower" speeds. 45 or less maybe?
I think lower engine speeds. I can feel the difference below 3000rpm (slow jets) and above (high speed jets). Am running seafoam through now and above 3k it runs great. below it still sputters a bit but getting better. I think one more tankful will do it. |
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Sharkey
Member
Posts: 567
GOT CURVES??
VRCCDS0184
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« Reply #9 on: September 24, 2010, 05:52:13 AM » |
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If the cleaner does not work the jets are easy to replace. I removed the carbs, cleaned replaced the jets and reinstalled and synced the carbs in lesss than 5 hours. The inside of my carb bowls looked like this  The slow jets are the round brass in the middle lower right of the float area with the slot cut in the back.  I also removed the pilots, and floats. Let it sit with Gumout for a while and used compressed air to clean everything out. Ran like a new bike. Like stated the jets are much cheaper at Chapparal racing than the dealer. |
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Kilroy
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« Reply #10 on: September 24, 2010, 07:33:47 AM » |
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Seems like I have read somewhere here that the slow jets only work up to 25 or 35 mph the the mains kick in. I would use the sea foam or Berrymans or the like and run it at 30 or so and that should help
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2qmedic
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« Reply #11 on: September 24, 2010, 08:59:52 AM » |
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Slow speed jets are in use under 3000 rpm as I understand.  |
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« Last Edit: September 24, 2010, 09:06:23 AM by 2qmedic »
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Bigdog
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« Reply #12 on: September 25, 2010, 07:39:55 PM » |
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Man this is great, I read somewhere on here about I/S springs in carb and something else they done to make it a lil more peppy. If I have to pull carbs and clean, I might as well beef it up a lil...
What do you use to sync carbs?
Thanks also for the pics....!!!
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This country, with its institutions, belongs to the people who inhabit it. Whenever they shall grow weary of the existing government, they can exercise their constitutional right of amending it or their revolutionary right to dismember it or overthrow it." -- Abraham Lincoln, 4 April 1861
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trprbill
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« Reply #13 on: September 26, 2010, 09:08:09 AM » |
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Looks like it'll be too cold outside for you to ride it in a while, at least for a few weeks, so it'd be a good time to take the carbs off for cleaning, and at that point it's easy to do a desmog too. I was just thinking that the bigger slow speed jets would be better than smaller in colder climates?
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John U.
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« Reply #14 on: September 27, 2010, 04:42:37 PM » |
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The bigger slow jets are really not much bigger; 38 rather than the oem 35. You will need to adjust the pilot screw in to 1 3/4 out from lightly seated as compared to 2 1/4 with the stock slows (or be running rich at idle).
They are a "bit" more resistant to clogging. The main advantage IMHO is a reduction of the flat spot just before the main jets open up.
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John U.
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« Reply #15 on: September 27, 2010, 04:48:55 PM » |
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BTW, I/S springs can be installed with the carbs in place. Remove the chrome caps and plastic piece below. Carefully remove the rubber diaphragm, the springs are below. Be real careful when handling the diaphragm, even a pinhole will effect performance. Do a search on carb sych, you'll be off on another project.  |
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